Carburetor



Aug. 8, 1933.v c. J. ERADE cARBUREToR Filerneq. 24 1931 3 Sheets-Sheet 1 ug. '8, 1933. J, ERADE 1,921,736 v CARBURETOR Filed Dec. 24. 1931 5 Sheets-Sheet 2 ld-971% v Aug. 8, 1933. c. J. ERADE 1,921,736

CARBURETOR Filed nec. 24 1931 3 sheets-sheet 3 Patented Aug. 8, 1933 UNITED STATES PATENT OFFICE Claims.

My invention relates to a device for regulating the admission o1.' air, which is applicable. to carburetors of internal combustion engines, and in particular those employed on motor vehicles. -The 5 object of the said device is to prevent the sudden entry of too large a volume of air when the throttle of the carburetor is rapidly opened, and to obtain in this way a supply of4 air and petrol in the proportions required for the gaseous mixture to be supplied to the engine when it is desired to accelerate.

'It is known that, when the throttle of a carburetor having no such device is rapidly opened, it causes misring when the engine is running,

in view of the fact that the air which is light is on the other side to the vacuum produced by'` the suction of the engine, so thatit can be brought into the position of opening required for permitting air to reach the carburetor, means being provided for returning this valve to its initial position when the throttle is closed. The slow or rapid opening movement of the valve must be controlled because, if it opens too rapidly it will have no utility. It on the other hand it opened too slowly, it would retard too much the entry.

of air 'and during this` retardation the jet or jets would deliver too much petrol, thus producing misres and u neven running of the engine, inV

4 view of the met that the mixture would be too rich.

The means for obtaining suh a control, and applied to the device forming Ihe subject of the present invention, are described hereinafter with reference to the accompanying H: :ntic

drawings, in which:

Figurefi is a view in Velevation of a carburetor fltted with a device for regulating the admission of air, constructed according to theiinvention.

Figure 2 is a cross section of this device taken along the line,2-2 in Figure 1.

Figure 3 is a side elevation of the carburetor illustrating the throttle lever and controlling means for returning the valve.

(ci. zei- 64) Figures 4 and 5 are detail views of a modification of one of the controlling means shown in Figure 3.

Figure 6v is a constructional modification of the valve arrangement shown in Figure 1.

Figure 7 is a cross section taken along the line 7-7 in Figure 6.

Figure 8 shows another modiiied form of construction.

Figure 9 is a crosssection of a modiiication 65 of the device for regulating the admission of air, shown in Figures 1 and 2.

Figure 10 is a side elevation of .the modication shown in Figure 9.

Figure 11 is a detail diagrammatic section show- 70 ing the application of the arrangement shown in Figure 10.

In the constructional examples shown in Figures 1 and 2, the device provided for regulating" the admission of air comprises a duct or chamber 10 xed to the end of the carburetor 11, for example by means of bolts or th'e like l2, engaging in brackets or lugs 10a and 11a respectively provided on the duct and on the carburetor.

The valve itself is preferably composed of a 30 iiap or plate 13 pivotally mounted in the chamber 10 on a spindle 14 arranged in Figures 1 and 2 at the side of the chamber 10.

The opening movement of the valve is controlled by the friction of two washers 16 and 35 20 rigid with the spindle 14 upon the bushes l18 and 18a of this spindle, whichfriction is obtained by means of a spring 15 interposed between the washer 16 and a washer 17 held xed by a pin'19.or the like at the' end of the said 90 spindle.

The tensionof the spring 15 can be regulated either by displacing the pin 19 in one of the holes 21 provided in the spindle 14 or by placing one or more washers between this pin and the spring 96 15; or the tension may beregulated by a nut and counter nut mounted upon the spindle, or by any other of the numerous known means and methods employed for regulating the tension of a Spring.

When the engine is accelerated, the valve 13 is pshed towards the interior of the carburetor by the atmospheric pressure, to an' extent which depends upon the adjustmentof the spring 15.

According to the invention, in order to allow 105 the valve 13 to return to its minimum p omtion of opening when the engine is running slowly, the usual throttle lever 22 or the carburetor is provided with an extension or arm 23 carrying at its enda roller or stop 24'which, when theY 11 throttle 25 of the carburetor is operated, acts upon a lever or cam 27.

As shown in Figure 1, the valve 13, upon returning to its closed position, abuts against a screw 28 mounted in a boss 29 rigid with the chamber or body 10 of the device.

In order to permit the closure of the valve 13 to be advanced or retarded when the throttle lever 22, 23 returns to the slow running position of the carburetor, the roller 24 actuatingr the cam 27 may be mounted upon a shaft 30 (Figures 4 and 5) having a cylindrical part 31 upon which the said roller turns, and which is eccentric with reference to its point of attachment. Such an arrangement will permit the roller 24 to occupy different angular positions upon its shaft, according to the extent to which the closure of the valve 13 -is advanced or retarded.

Naturally, instead of mounting the valve 13 as Vshown in Figure 1, it may move about an axis mounted eccentrically with respect to the axis axial part 33a of which is suitably guided in the interior of this chamber, and is acted upon by the pressure of a spring 34 lodged in a guiding recess 35 rigid with the said duct, the other part 33h of this rod having a slot 33e for receiving the end of a lever 36, 37 pivoted at 38 to the end of a support 39 mounted on the duct 10. The throttle lever 22 acts upon the end 37a of the lever 36, 31 in order to return the valve to its closed position. The flap-shaped valve shown in Figures 1 and 2 is preferable to the other devices described and illustrated, in view of the fact that, when it is completely open, it does not obstruct the air inlet duct of the carburetor in any way.

Moreover, in the construction it is preferable to employ as light a valve as possible, so that the valve will not be displaced by the variations due to the of the engine.

According to a constructional modication of the braking mechanism for the valve shown in Figs. 1 and 2, there may be provided advanta geously a hydraulic or pneumatic dash-pot adapted to control the movement of the said valve in the direction of opening. Y (Figs. 9 and 10.)

To this end the casing or chamber 10 may be -formed with a lateral projection 40 having, ex-

tending therefrom, a cylinder 41 the outer end of which is closed by a cylinder cover plate 42, said cylinder having reciprocally mounted therein a piston 43 connected by means of a connecting rod to the end of a hand lever 45 secured to the spindle 14 of the valve 13, said spindle being eccentrically mounted in the duct 10, as shown in Fig. 6.

Considering the eccentricity of the spindle 14 relative to the valve 13, it will be easily understood that-when the throttle valve of the carburetor will be opened, the atmospheric pressure will act more effectively upon the face 13a than upon the face 13b of said valve, so as to allow a slow opening movement thereof.

During the opening of the valve 13, the spindle which inside the cylinder 41 is controlled by the uidfcontained in the latter.

In order to keep the valve in its positionof maximum opening use may be made if desired of a pawl or catch which under the action of a spring, becomes lodged either in a recess or on a plane surface on the lever or cam rigid with the spindle of the valve.

In order to release this pawl or catch a littl before the throttle control lever encounters the above mentioned lever or cam, a stop fixed on this lever may be provided, so as to act on this said pawl in order to release it from the lever or from the cam, and thus release the valve. V

An air choke or closing device of the usual kind for use when starting the engine may also,l

l. A device for regulating the admission of air f to an internal combustion engine carburetor provided with a main duct, a throttle valve in this duct and a throttle lever operatively connected to this throttle valve, comprising a chamber mounted on the. inlet end of the air duct and in alignment with this duct, an air intake valve in this chamber opening under the action of difference of pressure acting on its two surfaces, means for braking this displacement of said valve and maintaining the latter in any position of opening, and means for positively returning said valve to its initial closed position by the action of the throttle lever only during the -last period of the return stroke of this lever into its position for the slow running of the engine.

r2. A device for regulating the admission of air to an internal combustion engine carburetor provided with an air inlet duct, a throttle valve in this duct and a throttle lever operatively connected to this throttle valve, comprising a chamber mounted on the end of the air inlet duct and in alignment with this duct, an air intake valve in this chamber opening under the action of dif- A,

this duct and a throttle lever operatively connected to this throttle valve, comprising a chamber mounted on the end of the air inlet duct and in alignment with this duct, an air intake valve in this chamber opening under. the action of difference of pressure acting on its two surfaces, a shaft on this valve eccentrically mounted with respect to the axis of the chamber, friction washers rigid with the shaft, two friction plates on the bushes of this shaft, a spring maintained at one end of said shaft for elastically pressing said washers on said friction plates, an extension .of the throttle lever provided at its end with a roller, a cam xed at the other end of the valve shaft receiving the action of the throttle lever during the last period of the return stroke of said lever into its position for the slow running of the engine.

4. A device for regulating the admission of air t0 an internal combustion engine carburetor provided with an air inlet duct, a throttle valve in this duct and a throttle lever operatively connected to this throttle valve, comprising a chamber mounted on the end of the air inlet duct and in alignment with this duct, an air intake valve in this chamber opening under the action of difference of pressure acting on its two surfaces, a shaft on this valve eccentrically mounted with respect to the axis of this chamber, a lever xed at one end of this shaft, a dash-pot, a piston into an internal combustion engine carburetor provided with an air inlet duct, a throttle valve in this duct and a throttle lever operatively connected to this throttle valve, comprising a chamber mounted on the end of the air inlet duct and in alignment with this duct, a spring controlled valve mounted in this chamber and exposed to atmospheric pressure on one side and to the suction of the engine on the other side and havingv a spindle arranged coaxially with the axis of the said chamber, a spring actuated pin mounted in the side Wall of the said chamber and arranged so as to bear on the stem of said valve so as to resist any movement of this valve, a linkage connecting the throttle lever to said valve stem and so arranged that the said valve is closed by the closing movement of the throttle lever.

CHARLES JULIEN ERADE. 

